Now that we have patched the btcwallet version to the one that includes
the fix, we can adjust the rescan test to show the correct and expected
behavior.
In this commit we add a test that demonstrates the problem of ghost
UTXOs lingering in the wallet after a re-scan, even if they were spent.
NOTE: This test shows the incorrect behavior and will be adjusted in a
follow-up commit to show the correct behavior after patching the
btcwallet version.
This commit was previously split into the following parts to ease
review:
- 2d746f68: replace imports
- 4008f0fd: use ecdsa.Signature
- 849e33d1: remove btcec.S256()
- b8f6ebbd: use v2 library correctly
- fa80bca9: bump go modules
We add an additional test case to the on-chain fund recovery test that
tries restoring the same wallet from the extended master root key
instead of the seed.
